Nope these are all just pipe dreams.
Now hard drives or cdroms/floppies wont work at cold temps or in a liquid.
Sometimes motherboards have a hard time at cold temps also.
Mineral oil doesnt pump too great at low temps,heck it doesnt pump great when warm heh.
I have done submersion,but my epox didnt live through it,still cant understand what happend.Mineral oil sure does get things messy....
But at least I can say Yeah I did that!
The reason I did it was to prevent condensation....